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Old 10-16-2013, 11:19 AM   #1
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house wrap question


I get different opinions on this subject and was curious what you guys think of using a fanfold insulation over house wrap? Would this create a double vapor barrier even though house wrap is not considered one?

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Old 10-16-2013, 03:24 PM   #2
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house wrap question


In some places it's acceptable.
We usually try to put the house-wrap outside.

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Old 10-16-2013, 05:40 PM   #3
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house wrap question


Its fine in a majority of the cases.

We put the housewrap to the outermost layer as well.
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Old 10-16-2013, 06:27 PM   #4
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Its fine in a majority of the cases.

We put the housewrap to the outermost layer as well.
So, then you just cut fanfold for the opening for windows, etc. and then house wrap over that and integrated into the flashing? If I install fanfold over house wrap since house wrap is already there do all the vinyl siding trim pieces go over the fan fold or can it be tucked into the j trim and corner posts and just above the starter strip?
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Old 10-17-2013, 08:44 AM   #5
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house wrap question


Assuming you mean 1/4 inch extruded fanfold, you are increasing your R Value 1.25 Is this really worth it?
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Old 10-17-2013, 09:08 AM   #6
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Assuming you mean 1/4 inch extruded fanfold, you are increasing your R Value 1.25 Is this really worth it?
Can you please answer my last post?
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Old 10-17-2013, 12:55 PM   #7
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Can you please answer my last post?
Ill try. Your trim pieces are sized to accept your siding, not the siding and the fan fold, so I would say to put the trim pieces over the fan-fold if you do it that way. You may want to rip and place a PT wood or PVC nailer around openings, the wrap them with peel and stick so you have better nailing for your channels around openings, and butt your fan fold up to the nailers.

Joe C and Eric will probably chime in here, but thats what I would do. I would not nail through the fan-fold.
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Old 10-17-2013, 01:12 PM   #8
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Ill try. Your trim pieces are sized to accept your siding, not the siding and the fan fold, so I would say to put the trim pieces over the fan-fold if you do it that way. You may want to rip and place a PT wood or PVC nailer around openings, the wrap them with peel and stick so you have better nailing for your channels around openings, and butt your fan fold up to the nailers.

Joe C and Eric will probably chime in here, but thats what I would do. I would not nail through the fan-fold.
the 1/4" fanfold and the vinyl siding can fit in a j channel. What do you mean use a furring strip around openings?
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Old 10-17-2013, 01:15 PM   #9
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Ill try. Your trim pieces are sized to accept your siding, not the siding and the fan fold, so I would say to put the trim pieces over the fan-fold if you do it that way. You may want to rip and place a PT wood or PVC nailer around openings, the wrap them with peel and stick so you have better nailing for your channels around openings, and butt your fan fold up to the nailers.

Joe C and Eric will probably chime in here, but thats what I would do. I would not nail through the fan-fold.
The window is already installed though and has integrated channels for the siding.
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Old 10-17-2013, 10:10 PM   #10
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house wrap question


Most of the J-channels out there should have enough clearance for the fan fold.

Most fan folds are more applicable for surface leveling than they are insulation.

Jagans is right though that you need to check the fitment with an integrated J-channel.
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Old 10-18-2013, 04:03 PM   #11
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Most of the J-channels out there should have enough clearance for the fan fold.

Most fan folds are more applicable for surface leveling than they are insulation.

Jagans is right though that you need to check the fitment with an integrated J-channel.
Check the fitment?
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Old 10-18-2013, 05:04 PM   #12
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Depth of the combo so it will fit into the window J.

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